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Homework 1
- The charge of an electron is −1.60 × 10
− 19
C
. A current of 2 A flows in a wire carried by electrons. How
many electrons pass through a cross section of the wire each second?
- The circuit element shown below has v = 15 and
i
ba
=− 3 A
. What is the value of
v
ba
? Be sure to give the
correct algebraic sign. What is the value of i? Is power absorbed or delivered to the element?
- The net charge through a cross section of a circuit element is given by
q ( t )= 5 + 4 t C. Find the current
through the element.
- Compute the power for each element shown below. For each element, state whether power is being
absorbed by the element or supplied by it.
- Suppose the cost of electrical energy is $0.20 per kilowatt hour and that your electrical bill for 30 days
is $75. Assume that the power delivered is constant over the entire 30 days. What is the power in
watts? If the power is supplied by a voltage of 120V, what is the current? Part of your electrical load is
a 60W light bulb that is on continuously. By what percentage can you reduce your energy consumption
by turning the light off?
